Week 1 Last Menstrual Period.
Week 2 When Conception occurs, the baby’s features, including sex, hair, and eye color, are determined.
Week 3 Baby attaches to the uterus.
Week 4 Nerves, brain, and spinal cord begin to develop.
Week 5 The baby’s heart begins to beat.
Week 6 Eyes, arms, legs, lungs, and stomach begin to form.
Week 7 Hands and feet are forming.
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